Nickel oxide nanowires: vapor liquid solid synthesis and integration into a gas sensing device

In the field of advanced sensor technology, metal oxide nanostructures are promising materials due to their high charge carrier mobility, easy fabrication and excellent stability. Among all the metal oxide semiconductors, nickel oxide (NiO) is a p-type semiconductor with a wide band gap and excellen...

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Bibliographic Details
Published in:Nanotechnology 2016-05, Vol.27 (20), p.205701-205709
Main Authors: Kaur, N, Comini, E, Zappa, D, Poli, N, Sberveglieri, G
Format: Article
Language:English
Subjects:
Catalysts
gas sensing
Gas sensors
Hydrogen
Liquids
Nanowires
nickel oxide
Nickel oxides
Palladium
Raman spectroscopy
scanning electron microscope
Sensors
vapor liquid solid method
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Summary:In the field of advanced sensor technology, metal oxide nanostructures are promising materials due to their high charge carrier mobility, easy fabrication and excellent stability. Among all the metal oxide semiconductors, nickel oxide (NiO) is a p-type semiconductor with a wide band gap and excellent optical, electrical and magnetic properties, which has not been much investigated. Herein, we report the growth of NiO nanowires by using the vapor liquid solid (VLS) technique for gas sensing applications. Platinum, palladium and gold have been used as a catalyst for the growth of NiO nanowires. The surface morphology of the nanowires was investigated through scanning electron microscopy to find out which catalyst and growth conditions are best for the growth of nanowires. GI-XRD and Raman spectroscopies were used to confirm the crystalline structure of the material. Different batches of sensors have been prepared, and their sensing performances towards different gas species such as carbon monoxide, ethanol, acetone and hydrogen have been explored. NiO nanowire sensors show interesting and promising performances towards hydrogen.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/27/20/205701